/Engine/Source/Runtime/InteractiveToolsFramework/Public/InteractiveToolManager.h
Let active Tools do their screen space drawing. Called byUInteractiveToolsContext.
virtual void DrawHUD ( [FCanvas](API\Runtime\Engine\FCanvas) * Canvas, [IToolsContextRenderAPI](API\Runtime\InteractiveToolsFramework\IToolsContextRenderAPI) * RenderAPI )